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Income tax credit/(expense) - Reconciliation of total tax credit/(expense) (Details) - GBP (£)
1 Months Ended 12 Months Ended
Apr. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2020
Reconciliation of the total tax expense        
Loss before income tax   £ (149,623,000) £ (24,027,000) £ (20,818,000)
Loss before tax multiplied by UK corporation tax rate (weighted average US federal corporate income tax rate) of 19.0% (2021: 21.0%; 2020: 21.0%)   28,428,000 5,046,000 4,372,000
Tax effects of:        
Adjustment in respect of previous years   512,000 663,000 (1,236,000)
Difference in tax rates on non-US operations     216,000 26,000
Recognition of UK R&D tax claims in respect of previous years       537,000
Foreign exchange (losses)/gains on US dollar denominated tax basis     (3,146,000) 735,000
(Expenses not deductible for tax purposes)/income not taxable   (1,197,000) (526,000) 757,000
Irrecoverable foreign tax credits   (625,000)    
Impact of change in UK Corporation tax rate   6,995,000 (77,785,000)  
Unrealized foreign exchange gains/(losses) not taxable in the US     7,343,000 (3,690,000)
Re-measurement of foreign tax credit US deferred tax asset       (3,916,000)
Total income tax credit/(expense)   £ 34,113,000 £ (68,189,000) £ (2,415,000)
US        
Tax effects of:        
Corporate tax rate   21.00% 21.00% 21.00%
UK        
Tax effects of:        
Corporate tax rate 25.00% 19.00% 19.00%